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The value of main is displayed on screen. Function asText turns any value into a displayable textual representation. Mouse.position is a value that changes over time, called a signal. Function lift ensures that asText is applied to Mouse.position every time the mouse moves.
Elm has a small but expressive set of language constructs, including if-expressions, let-expressions, case-expressions,
factorial n = product [1..n]▼
▲Elm has a small but expressive set of language constructs, including if-expressions, let-expressions, case-expressions, and anonymous functions.
<source lang="haskell">
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-- anonymous functions
keepEvens3 numbers = filter (\n -> n `mod` 2 == 0) numbers
-- list interpolation
▲factorial n = product [1..n]
</source>
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